| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package edu.uci.ics.pregelix.api.io.generated; |
| |
| import java.io.IOException; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.io.Writable; |
| import org.apache.hadoop.io.WritableComparable; |
| import org.apache.hadoop.mapreduce.InputSplit; |
| import org.apache.hadoop.mapreduce.TaskAttemptContext; |
| |
| import edu.uci.ics.pregelix.api.io.BasicGenInputSplit; |
| import edu.uci.ics.pregelix.api.io.VertexReader; |
| import edu.uci.ics.pregelix.api.io.WritableSizable; |
| |
| /** |
| * Used by GeneratedVertexInputFormat to read some generated data |
| * |
| * @param <I> |
| * Vertex index value |
| * @param <V> |
| * Vertex value |
| * @param <E> |
| * Edge value |
| */ |
| @SuppressWarnings("rawtypes") |
| public abstract class GeneratedVertexReader<I extends WritableComparable, V extends Writable, E extends Writable, M extends WritableSizable> |
| implements VertexReader<I, V, E, M> { |
| /** Records read so far */ |
| protected long recordsRead = 0; |
| /** Total records to read (on this split alone) */ |
| protected long totalRecords = 0; |
| /** The input split from initialize(). */ |
| protected BasicGenInputSplit inputSplit = null; |
| /** Reverse the id order? */ |
| protected boolean reverseIdOrder; |
| |
| protected Configuration configuration = null; |
| |
| public static final String READER_VERTICES = "GeneratedVertexReader.reader_vertices"; |
| public static final long DEFAULT_READER_VERTICES = 10; |
| public static final String REVERSE_ID_ORDER = "GeneratedVertexReader.reverseIdOrder"; |
| public static final boolean DEAFULT_REVERSE_ID_ORDER = false; |
| |
| public GeneratedVertexReader() { |
| } |
| |
| @Override |
| final public void initialize(InputSplit inputSplit, TaskAttemptContext context) throws IOException { |
| configuration = context.getConfiguration(); |
| totalRecords = configuration.getLong(GeneratedVertexReader.READER_VERTICES, |
| GeneratedVertexReader.DEFAULT_READER_VERTICES); |
| reverseIdOrder = configuration.getBoolean(GeneratedVertexReader.REVERSE_ID_ORDER, |
| GeneratedVertexReader.DEAFULT_REVERSE_ID_ORDER); |
| this.inputSplit = (BasicGenInputSplit) inputSplit; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| } |
| |
| @Override |
| final public float getProgress() throws IOException { |
| return recordsRead * 100.0f / totalRecords; |
| } |
| } |